HP 8360 B Series User Manual page 170

Bit 3: SRQ caused by the completion of phase locking and the
settling of the RF source (use the OK code to determine the last lock
frequency).
Bit 4: SRQ on end-of-sweep or mid-sweep update in NA (network
analyzer code) mode.
Bit 5: SRQ caused by HP-IB syntax error.
Bit 6: SERVICE REQUEST; by IEEE-488 convention, the
instrument needs service from the controller when this bit is set true.
Bit 7: SRQ caused by a change in the coupled parameters (start
frequency, center frequency, and sweep time). Use the OC code to
determine the new values of the coupled parameters.
Status Byte 2 (Extended Status Byte)
Bit 0: Self test failed at power on or at Instrument Preset. This bit
remains latched until this status byte has been read, or until cleared
by the CS or CLEAR 719 commands.
Bit 1: Excessive amplitude modulation input.
Bit 2: Oven for the reference crystal oscillator is not at operating
temperature.
Bit 3: External reference frequency is selected.
Bit 4: RF is unlocked (UNLOCK appears in the message line). Use
OF to determine the source of the unlocked output. This bit remains
latched until this status byte has been read, or until cleared by the
CS or CLEAR 719 commands.
Bit 5: ac line power interruption has occurred since the last
Instrument Preset. This bit also remains latched until read or
cleared.
Bit 6: RF is unleveled (use OR to determine present power level).
This bit also remains latched until read or cleared.
Bit 7: FAULT message is displayed. Use OF to determine the cause
of the fault.
See Also SCPI STATUS REGISTER
Chapter 3
ANALYZER STATUS REGISTER
Operating and Programming Reference A-21